On the court, Simons is an interesting fit in Boston. This trade is a major defensive downgrade for the Celtics, who excelled by giving opponents no weak links to attack in their starting five. The 6-foot-3 Simons has historically been rated as one of the league's worst defenders in terms of plus-minus impact, adjusted for teammates, opponents and shooting luck.
Even last season, when the Blazers dramatically improved defensively and ranked just ahead of Boston at third in points allowed per 100 possessions over the second half of the season, Simons rated near the bottom of the league in luck-adjusted defensive RAPM (regularized adjusted plus-minus) from BBall-Index.com. Simons' estimated impact of 2.0 points per 100 possessions is worse than that of an average defender ranked in the bottom 20. No Celtics player was in the bottom 170.